Hollander



Feb. 6, 1934. I H, BANNlNG 1,946,347

HOLLANDER Filed Oct. 2, 1930 Patented Feh, 1934 UNITED STATES PATENT OFFICE HOLLANDEE Helmut Banning, Duren, Germany Application October 2, 1930, Serial No. 486,036, and in Germany July 10, 1929 2 Claims.

material and at the same-time to increase the` lift or height to which the material is raised.

Previously the scoop cells of the hollander roll l which are formed by the blades have been used as conveying means which raise the material entering the cells in front of the block or bedplate over a breasting disposed at a small spacing from the roll. For reasons concerned with the driving of the roll this breasting is at a certain spacing from the roll and this spacing increases as the roll wears away. Consequently the velocity of the material between roll and breasting is smaller than the speed of the roll, so that frictional losses occur and further the kinetic energy imparted to the material by the roll is destroyed. Thus the construction at present in use permits of the height of the breasting being only up to about the centre of the roll. and this has given rise in large hollanders to rolls of large diameter in order to obtain good transportation of the material without excessive expenditure of power.

The invention is based on the realization that it is possible by correctly utilizing the kinetic energy of the material to obtain liits or heights of projection in hollanders which permit of material of the highest density being introduced and of troughs of large capacity being used with rolls of small diameter. In order to attain this result, in hollanders having a lateral block or bed plate terminating above the centre of the rolll according to the invention the hood contiguous with or extending from the block in the direction in which the material is thrown oil from the pounding roll, is so shaped as to be curved downwardly at its end and attached to a return trough which returns the material to the hollander and preferably is disposed at a higher level than the apex of the pounding roll. In this way the material thrown off from the roll is freely projected through space and into the return trough without impairing the energy of projection so that the height of projection is the greatest possible.

The construction 4,of a hollander according to the invention is represented schematically in the accompanying drawing. 'I'he material is fed to the hollander roll 1 in known manner through a trough. The block or bed plate 2 is disposed laterally of the roll in such manner that it terminates above the centre of the roll. Beyond the block, a hood 3'is disposed so as to permit of material thrown olf from the roll flying off tangentially without obstruction. The hood 3 guides the material into a return trough 4 which is attached to the hood 3. As in other known hollanders in which the material is thrown over,

the return trough 4 conveys the material back to the roll l.

It is apparent that the block 2 forces the material taken up by the cells between the blades completely into the cells so that beyond the block the material is in fact thrown 01T in consequence of centrifugal action at the full speed of the roll.

Any material which is splashed or particles which remain in the cells as a result of adhesion cannot cause the exit passage beyond the block to become stopped or give rise to an accumulation of material at this point, as the roll l would constantly convey away any such accumulation;

Consequently the troughv 4 can be disposed above the hollander roll and thus the surface of the material in the trough 4 can also be above the crown of the hollander roll. A hollander constructed in this manner can accordingly be equipped with a roll of comparativelysmall diameter as the lift can be increased far beyond the height of the hollander roll itself. As during its passage from the roll to the trough 4 the 90 material is in no way connected with the hollander roll itself the consumption of power is extremely small as only the kinetic energy imparted to the material in consequence of the actual pounding process is used for conveying the material.

The hollander construction described above gives a valuable arrangement in consequence of the small diameter of the roll which arrangement in addition aords advantages as compared with y tion of the roll.

into the apparatus; due to the large lift which is possible.

this is of particular importance i What claim is:-

1. A paper mill or hollander of the character described, comprising a trough for the reception of material to be treated, a roller mounted in said trough for rotation toward the incoming material, a bed-plate forming a portion of the wall of the trough and extending upward at one side of the roller to a line above the center line of said roller, a return channel disposed at the opposite side of said roller, and a hood extending tangentially from the upper edge of the bedplate to the outermost wall of said channel thereby to form an unobstructed tangential path for material leaving the roller and to direct said material into the channel.

2. A paper mill or hollander, comprising a and at a level above the incoming material and the crown of the roller,A and a hood extending tangentially from the upper edge of the bed-plate to the top edge of the outermost wall of said channel thereby to form an unobstructed tangential path for material leaving the roller and to direct said material into the channel.

MLMUT BANNING. 

